WO2006112196A1 - 電離放射線架橋用ポリブチレンテレフタレート樹脂ペレット - Google Patents
電離放射線架橋用ポリブチレンテレフタレート樹脂ペレット Download PDFInfo
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- WO2006112196A1 WO2006112196A1 PCT/JP2006/304565 JP2006304565W WO2006112196A1 WO 2006112196 A1 WO2006112196 A1 WO 2006112196A1 JP 2006304565 W JP2006304565 W JP 2006304565W WO 2006112196 A1 WO2006112196 A1 WO 2006112196A1
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- Prior art keywords
- polybutylene terephthalate
- crosslinking agent
- terephthalate resin
- resin
- cross
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/12—Powdering or granulating
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/183—Terephthalic acids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/34—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices
- B29B7/38—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary
- B29B7/46—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft
- B29B7/48—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws
- B29B7/482—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs
- B29B7/483—Mixing; Kneading continuous, with mechanical mixing or kneading devices with movable mixing or kneading devices rotary with more than one shaft with intermeshing devices, e.g. screws provided with screw parts in addition to other mixing parts, e.g. paddles, gears, discs the other mixing parts being discs perpendicular to the screw axis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/30—Mixing; Kneading continuous, with mechanical mixing or kneading devices
- B29B7/58—Component parts, details or accessories; Auxiliary operations
- B29B7/60—Component parts, details or accessories; Auxiliary operations for feeding, e.g. end guides for the incoming material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/12—Making granules characterised by structure or composition
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/05—Filamentary, e.g. strands
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/285—Feeding the extrusion material to the extruder
- B29C48/297—Feeding the extrusion material to the extruder at several locations, e.g. using several hoppers or using a separate additive feeding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/88—Post-polymerisation treatment
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/20—Compounding polymers with additives, e.g. colouring
- C08J3/22—Compounding polymers with additives, e.g. colouring using masterbatch techniques
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B9/00—Making granules
- B29B9/02—Making granules by dividing preformed material
- B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
- B29C48/405—Intermeshing co-rotating screws
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
- B29K2067/006—PBT, i.e. polybutylene terephthalate
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/24—Condition, form or state of moulded material or of the material to be shaped crosslinked or vulcanised
- B29K2105/246—Uncured, e.g. green
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
Definitions
- the present invention relates to polybutylene terephthalate resin pellets for ionizing radiation crosslinking. Specifically, the present invention has excellent heat resistance and mechanical strength, and has excellent strength and reflow resistance and is suitable for lead-free solder.
- the present invention relates to a polybutylene terephthalate resin pellet for crosslinking.
- polybutylene terephthalate may be abbreviated as “PBT”.
- PBT resin is excellent in mechanical properties, electrical properties, and other physical 'physical properties', and has good workability. As an engineering plastic, it is used for automobiles, electrical and electronic devices. It is used for a wide range of applications. PBT resin has a relatively high melting point of 225 ° C and is excellent in heat resistance and chemical resistance. Therefore, it should be used as a housing material or electrical insulation material for electronic parts such as connectors. There are many.
- tin Z-lead alloy solder has been used for mounting electronic components on printed circuit boards, but due to recent environmental considerations, so-called lead-free solder that does not use lead has been put to practical use! / RU Since the melting point of lead-free solder is 20 to 40 ° C higher than that of conventional tin / lead alloy solder, the housing material for PCB connectors for surface mounting uses solder heat resistance at higher temperatures (reflow resistance) ), That is, performance that does not deform even when immersed in a solder bath is required.
- PBT resin for example, PBT and Tria
- a crosslinked film obtained by blending a crosslinking agent such as rilisocyanurate or triarylcyanurate, then extruding it into a film and irradiating it with an electron beam (Patent Document 1).
- Such a crosslinked film can retain its shape even after being immersed in a solder bath at 260 ° C. for 1 minute, and as the blending amount of the crosslinking agent is increased, the degree of crosslinking is improved and the solder heat resistance is improved. Is expected.
- the cross-linking agent has a double bond with high reactivity! /, And therefore, the cross-linking agent easily reacts with and denatures other than by irradiation with ionizing radiation, for example, by the action of heat or the like. To do.
- the reaction between the cross-linking agents occurs, resulting in denaturation. Irradiation with ionizing radiation does not cause a cross-linking reaction, and the heat resistance and mechanical strength are not improved to match the amount of cross-linking agent added to the PBT resin.
- triallyl isocyanurate (melting point: 24-26 ° C) and triarylcyanurate (melting point: 26-27 ° C) have a melting point near room temperature. Even if mixed and supplied to the extruder, it is melted by the heat of the extruder. And since the viscosity becomes lower than the molten resin in an extruder, the crosslinker which became liquid drips, and uniform mixing
- Patent Document 1 Japanese Patent Application Laid-Open No. 57-212216
- the present invention has been made in view of the above circumstances, and an object thereof is to provide a PBT resin pellet for ionizing radiation crosslinking having high reflow resistance and mechanical strength suitable for lead-free solder. is there. Means for solving the problem
- the present inventors control the method of supplying the crosslinking agent and the kneading conditions when the PBT is mixed and melted and kneaded to produce pellets. As a result, it was possible to prevent the modification of the cross-linking agent and obtain pellets in which the unreacted cross-linking agent remained at a high rate. Furthermore, a molded product having high unreacted crosslinking agent formed by using such pellets is irradiated with radiation to form a molded product having high reflow resistance and high mechanical strength. The present invention has been achieved successfully.
- the first gist of the present invention is a polybutylene terephthalate resin pellet for ionizing radiation crosslinking containing a crosslinking agent acting by ionizing radiation, wherein the crosslinking agent in the resin pellet
- a polybutylene terephthalate resin content is 1 to 25 parts by weight per 100 parts by weight of polybutylene terephthalate resin, and the proportion of unreacted crosslinking agent in the crosslinking agent is 75% by weight or more.
- the second gist of the present invention is to supply a polybutylene terephthalate resin to a twin screw extruder, supply a position force crosslinking agent downstream of the supply position of the polybutylene terephthalate resin, and The residence time in the extruder is maintained at 2 minutes or less, and the production method of the polybutylene terephthalate resin pellets is characterized by the above.
- the third gist of the present invention resides in a polybutylene terephthalate resin molded article for ionizing radiation crosslinking, which is obtained by molding the pellet according to the first gist.
- the PBT resin pellet of the present invention is improved in heat resistance such as reflow resistance and mechanical strength by irradiation with ionizing radiation.
- electrical and electronic equipment parts such as surface mount connectors, automobiles, etc. It can be used as a raw material resin pellet for a wide range of molded products such as electrical parts and mechanical precision parts.
- an excessive cross-linking agent is not required for the production.
- FIG. 1 is an explanatory view showing a part of a twin-screw extruder used in Examples and Comparative Examples. [0017] Al: First supply port
- A4 Fourth supply port
- the PBT resin used in the present invention is a polyester resin whose terephthalic acid component accounts for 80 mol% or more of the total dicarboxylic acid component and 1,4 butanediol accounts for 50% or more of the total diol.
- the terephthalic acid component preferably accounts for 85 mol% or more of the total dicarboxylic acid component, more preferably 95 mol% or more.
- 1,4 butanediol preferably accounts for 80 mol% or more of the total diol component, more preferably 95 mol% or more.
- the terephthalic acid component includes ester-forming derivatives such as alkyl terephthalate.
- the cross-linking agent used in the present invention is a compound having two or more ethylenically unsaturated bonds in the molecule.
- ditalylate type such as diethylene glycol ditalylate; Dimetatalylates such as tatalylate and dipropylene glycol dimetatalylate; Tritalylates such as trimethylol ethane tritalylate and trimethylol propane tritalylate; Trimethylol ethane trimethacrylate, trimethylol propane
- trimetatalates such as triallyl isocyanurate, triallyl cyanurate, diallyl malate, and diallyl fumarate.
- trimetatalates such as triallyl isocyanurate, triallyl cyanurate, diallyl malate, and diallyl fumarate.
- trimetatalates such as triallyl isocyanurate, triallyl cyanurate, diallyl malate, and diallyl fumarate.
- trimetatalates such as triallyl isocyanurate, triallyl cyanurate, diallyl malate, and diallyl fumarate
- the amount of the crosslinking agent used is 1 to 25 parts by weight, preferably 1 to 20 parts by weight per 100 parts by weight of the PBT resin as the content of the crosslinking agent in the PBT resin pellets described later. Preferably 2 to 15 parts by weight, most preferably 2 to 12 parts by weight. If the content of the crosslinking agent is too small, crosslinking does not proceed even when irradiated with ionizing radiation, and the original effect of the crosslinking agent cannot be obtained. On the other hand, if the content of the cross-linking agent is too large, the color tone of the molded product will change drastically and the mechanical strength will decrease. In addition, there is a concern that molding troubles may occur due to the scattering of the crosslinking agent during the production of molded products.
- the greatest feature of the present invention is that 75% by weight or more of the cross-linking agent in the PBT resin pellet is unreacted.
- the proportion of the unreacted crosslinking agent is preferably 80% by weight or more, more preferably 85% by weight or more. If the proportion of unreacted crosslinker is less than the above range, molding from PBT resin pellets becomes difficult, and the strength of the crosslinker after irradiation with ionizing radiation does not progress after the molded product. Cannot be obtained.
- the PBT resin pellets of the present invention supply polybutylene terephthalate resin to a twin-screw extruder, and supply a cross-linking agent from a position downstream of the polybutylene terephthalate resin supply position.
- it can be produced by keeping the residence time of the crosslinking agent in the extruder at 2 minutes or less.
- the step of reducing the ratio of the unreacted crosslinking agent (the step in which the crosslinking agent reacts) High temperature That is, a step of producing a resin composition pellet by melting and kneading PBT and a crosslinking agent, and a step of forming a pellet of the melt-kneaded resin composition.
- the former melt-kneading step is particularly important for ensuring a high residual ratio of unreacted crosslinking agent, and the latter molding step is generally Since it is a closed system or the resin solidifies directly, denaturation of the crosslinking agent can be prevented if the resin temperature is kept appropriate.
- the method for producing a PBT resin pellet according to the present invention is achieved based on the above findings.
- a crosslinking agent having a melting point near room temperature such as triallyl isocyanurate and triallyl cyanurate, is used by being melted by heating and liquefied.
- the production method of the present invention is particularly suitable when a liquid crosslinking agent is used.
- twin screw extruder various types can be used as long as the twin screw extruder has at least two raw material supply ports.
- the rotation of the screw may be in the same direction or in a different direction, but the same-direction tangling twin screw extruder is preferred.
- the raw material supply ports will be the first supply port and the second supply port in order from the upstream side. Supply the main raw material PBT resin from the upstream supply port, and add or inject the liquid crosslinking agent from the downstream supply port using a liquid supply pump.
- a liquid supply pump At this time, by combining a screw configuration of the extruder with a reverse needing disk or a screw having a reverse screw structure, at least one resin filling region is provided upstream and downstream of the liquid crosslinking agent supply port, respectively. The area is not completely filled with liquid cross-linking agent.
- the liquid crosslinking agent By providing the resin-filled areas upstream and downstream of the supply position of the liquid crosslinking agent, the liquid crosslinking agent is prevented from flowing out to the upstream and downstream, and the resin between the resin-filled areas Since the concentration of the liquid cross-linking agent in the region can be increased, the liquid cross-linking agent can be easily dispersed in the resin by shearing by rotating the forward screw. Therefore, the kneading operation can be carried out continuously and stably. Sashiwa can also be incorporated into the resin in a substantially quantitative manner without losing the added liquid crosslinking agent.
- the extruder is further provided with a supply port for other components and a vent port for decompression or opening to the atmosphere. May be.
- a liquid cross-linking agent is added to PBT resin, if a vent with a high pressure reduction is provided after the addition of the cross-linking agent, the cross-linking agent volatilizes, making it difficult to add a predetermined amount of the cross-linking agent.
- the degree of vacuum at the vent port is usually 0 to 0.08 MPa, preferably 0 to -0.04 MPa with respect to atmospheric pressure.
- a particularly preferred embodiment is a mode in which a vent port having a high degree of vacuum is provided, and thereafter a seal portion is formed by a seal ring, a reverse screw, a reverse-singing disk, etc., and a crosslinking agent is added after the seal portion.
- the liquid crosslinking agent can be added without volatilization. In this case, volatile components other than air bubbles and crosslinking agents can be removed at the vent port, and stable extrusion is possible.
- the set temperature of the barrel and the die is usually 230 ° C to 285 ° C, preferably 240 ° C to 280 ° C.
- the rotation speed of the screw is usually 100 to 700 rpm, preferably 150 to 600 rpm.
- the rotation speed of the screw and the location of addition of the crosslinking agent are set so that the residence time of the liquid crosslinking agent in the extruder is 2 minutes or less. This is very important. In the above method, since the liquid crosslinking agent is easily dispersed in the resin, the liquid crosslinking agent is kneaded well into the resin even if the residence time in the extruder is 2 minutes or less.
- a reinforcing filler can be added to the resin composition for obtaining the PBT resin pellet of the present invention, if necessary.
- various fillers known as thermoplastic resin fillers can be used, and the shape thereof may be any of a fibrous shape, a plate shape, and a granular shape.
- specific examples of reinforcing fillers include fiber fillers such as glass fibers, carbon fibers, mineral fibers, metal fibers, ceramic whiskers, and wollastonite; plate-like fillers such as glass flakes, My strength, and talc; silica And particulate fillers such as alumina, glass beads, carbon black and calcium carbonate.
- Criteria for selecting fillers depend on the properties required for products formed from PBT resin pellets. Generally, when mechanical strength and rigidity are required, fibrous fillers, especially glass fibers, are selected, and when it is required to reduce the anisotropy and warpage of molded products, plate-like fillers are required. Especially, my power is preferable. In addition, the granular filler is selected in consideration of the overall balance that takes into account the fluidity during molding. These are selected according to known techniques.
- glass fiber is generally used for reinforcing a resin, specifically, a long fiber type. (Roving), short fiber type (chopped strand), etc. are used, and the fiber diameter is usually
- the glass fiber may be used after being treated with, for example, a sizing agent such as polyvinyl acetate or polyester, a coupling agent such as a silane compound or a boron compound, or another surface treatment agent.
- a sizing agent such as polyvinyl acetate or polyester
- a coupling agent such as a silane compound or a boron compound
- the supply position of the filler in the extruder is not particularly limited.
- it is preferably supplied downstream of the cross-linking agent supply port.
- the PBT resin composition for obtaining the PBT resin pellets of the present invention may contain a resin additive other than those described above.
- a resin additive is not particularly limited.
- an antioxidant for example, an antioxidant, a heat stabilizer, a weather stabilizer, a lubricant, a mold release agent, a catalyst deactivator, a crystal nucleating agent, a crystallization accelerator, Examples include ultraviolet absorbers, dyes and pigments, antistatic agents, foaming agents, plasticizers, and impact resistance improvers.
- thermoplastic or thermosetting resin can be blended with the PBT resin composition for obtaining the PBT resin pellet of the present invention, if necessary.
- resins include, for example, thermoplastic resins such as polyethylene, polypropylene, polystyrene, polyacrylonitrile, polymethacrylate, ABS resin, polycarbonate, polyamide, and polyphenylene sulfide, phenol resin, and melamine resin.
- thermosetting resins such as silicone resins and epoxy resins. Two or more of these rosins may be used in combination.
- the supply position in the extruder for the above-mentioned resin additives and other resins is not particularly limited, and may be the same supply port as the 1S PBT resin, or another supply port.
- a molding method for obtaining the molded product of the present invention from the PBT resin pellets of the present invention a normal molding method, that is, injection molding, extrusion molding, compression molding, hollow molding, or the like is employed. Then, molded articles used in various electric and electronic equipment fields, automobile fields, mechanical fields, medical fields, etc. can be obtained from the PBT resin pellets of the present invention.
- a particularly preferable molding method is injection molding or extrusion molding because of the good fluidity of the PBT resin pellets of the present invention.
- the resin temperature in injection molding or extrusion molding is usually 230 to 290 from the viewpoint of securing the residual ratio of the crosslinking agent. C, preferably 240-280. C.
- Examples of the ionizing radiation include an electron beam and ultraviolet rays.
- the electron beam for example, a 400KGy electron beam is used.
- the electron beam is, for example, a known various electric power source such as a dasamitron type.
- the beam accelerator power can be easily released.
- ultraviolet light can easily obtain light source power such as a low-pressure mercury lamp and a metal halide lamp.
- a twin screw extruder configured as shown in Fig. 1 was used.
- the twin-screw extruder has a first supply port (A1), a second supply port (A2), a third supply port (A3), a vent (B), and a fourth supply port (A4) in order from upstream.
- a die (not shown) is installed at the tip.
- reference numerals (1), (3), (5), (7) and (9) denote forward screw screw parts
- reference numerals (2), (4) and (6) denote -One ding disc
- symbol (8) indicates a seal ring.
- the above-mentioned forward screw screw part is composed of three types of screws with different lengths and leads.
- the needing disk section (2) is composed of 10 forward-needing disks from the upstream side of the extruder, 5 direct-singing disks and 5 reverse-singing disks.
- the needing disk sections (4) and (6 ) Is composed of five sequential knee discs, five straight knee discs, and five reverse-one discs.
- PBT resin was supplied to the first supply port (A) at 13 kgZhr, and the glass fiber was supplied to the third supply port (A3) at 6 kgZhr.
- Triallyl isocyanurate was heated and melted, and was supplied from the fourth supply port (A4) at 1 kgZhr (5% by weight of the composition) using a liquid supply pump.
- the proportion of triaryl isocyanurate is 5% by weight in the composition and As a proportion, it is 7.69% by weight.
- the extruder was operated at a barrel set temperature: 250 ° C, a die set temperature: 260 ° C, and a screw rotation speed: 200rpm.
- the degree of vacuum of the vent was 0.09 MPa.
- a resin-filled area was formed in front of the areas (2), (4), and (6), the seal ring (8), and the die where the reverse kneading disc was placed.
- the strand drawn from the tip of the die was cooled in a water tank and then cut to obtain a pellet.
- the residence time in the extruder was measured by the following method. During extrusion of a screw speed of each, the master batch Perret Tsu toe grains PBT ⁇ carbon black content 20 weight 0/0, the first, second, down to the fourth supply port, strands black from the time was measured as the residence time.
- PBT resin pellets and UL test pieces are frozen in liquid nitrogen, ground to 0.1 mm or less with an ultracentrifugal mill (“ZM100” manufactured by Retsch Co., Ltd.), and hexane extraction and And methanol extraction.
- ZM100 ultracentrifugal mill
- Pulverized product 1 Add 50cc of hexane to Og, stir with a magnetic stirrer for 30 minutes, solvent available Soluble components were extracted. This liquid was filtered with a filter paper, and the filtrate (filtrate 1) and the residue (filter residue 1) were collected. The residue 1 was further treated with 50 cc of hexane to extract a solvent-soluble component, followed by filtration in the same manner as above to collect a filtrate (filtrate 2) and a residue (filter residue 2). This operation was repeated to obtain filtrate-3 and residue (filter residue 3). Filtrate-1, Filtrate-2, and Filtrate-3 were combined and hexane was evaporated with a rotary evaporator to obtain a solvent-soluble component.
- the obtained solvent-soluble component was dissolved with 25 cc of black mouth form, and the component and amount were analyzed by gas chromatography.
- the analysis was performed using “GC-2010” and Colum “UA-17” (15 m) manufactured by Shimadzu Corporation under conditions of a temperature of 100 ° C. to 250 ° C. and a heating rate of 10 ° C. Z.
- the solvent soluble component was TAIC.
- Solvent-soluble components were further extracted from the residue 3 with methanol. Methanol extraction was repeated 5 times in the same manner as above. Methanol-extracted filtrate (5 portions) was mixed and methanol was evaporated by a rotary evaporator in the same manner as above to obtain a solvent-soluble component. To the solvent-soluble component thus obtained, 25 cc of chloroform was added and dissolved, and the components and amounts were analyzed by gas chromatography in the same manner as described above. As a result of the analysis, the solvent-soluble component was TAIC.
- the total amount of TAIC determined by the above hexane extraction method and methanol extraction method was defined as the unreacted TAIC amount. Divide the amount of unreacted TAIC by the amount of remaining TAIC and multiply by 100 to unreacted TAI
- the residual ratio (%) of C was determined.
- the extruder was operated for 30 minutes under the conditions shown in each example, and the number of strand breaks was determined and used as an index of extrusion stability. The lower the number, the more stable the extrusion.
- the superiority or inferiority of the solder heat resistance was evaluated by measuring the storage elastic modulus of dynamic viscoelasticity at 250 ° C. First, from a UL test piece (0.8 mm thick) irradiated with an electron beam, a test piece with a length of 30 mm and a width of 5 mm was cut out, and the test piece was sandwiched between jigs at 40 ° C to 250 ° C in 3 ° CZ minutes. The temperature rose. Next, the storage elastic modulus at each temperature was measured by applying a sinusoidal strain of 110 Hz. For measurement, a dynamic viscoelasticity measuring device (“Rheogel E-4000” manufactured by UBM) was used. 250 ° C Storage modulus is evaluated as a measure of the ease of load deformation at temperatures above the melting point of PBT resin at 250 ° C, indicating that the higher the storage modulus, the better the solder heat resistance. .
- Tensile strength was obtained by performing a tensile test at a speed of 2 mmZmin using ASTM No. 4 dumbbell pieces irradiated with an electron beam.
- the blending amount of PBT resin and TAIC, the number of screw revolutions, and the supply position of TAIC were changed as shown in Table 2, and the pelletized product was obtained in the same manner as in Example 1.
- the amount of TAI C was analyzed in the same manner as in Example 1, and the mechanical properties after electron beam irradiation were measured. The results are shown in Table 2.
- PBT and TAIC were used in the composition shown in Table 3 without compounding glass fiber, and pellets and molded products were produced in the same manner as in Example 1. Similarly, the amount of residual TAIC, extrusion stability, storage modulus, and strength were measured. It was measured. The results are shown in Table 3.
- solder heat resistance can be improved by selecting the melt-kneading conditions especially for pellet production so that the ratio of unreacted TAIC amount Z residual TAIC amount in PBT resin pellets can be secured to 75% or more. It was found that PBT resin pellets with excellent properties and strength (ie PBT resin molded products) can be obtained.
- the present invention it is possible to obtain a PBT resin molded article that does not inhibit the progress of crosslinking due to ionizing radiation irradiation without adding an excessive crosslinking agent, and further has improved solder heat resistance.
- the PBT resin pellets of the present invention have a wide range of fields such as electrical and electronic parts, automotive electrical parts, and mechanical precision parts that have improved heat resistance such as reflow resistance, as represented by surface mount connectors. It is applicable to.
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Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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EP06715436A EP1865018A1 (en) | 2005-03-30 | 2006-03-09 | Ionizing-radiation crosslinkable polybutylene terephthalate resin pellet |
US11/883,325 US20090023866A1 (en) | 2005-03-30 | 2006-03-09 | Ionizing radiation-crosslinking polybutylene terephthalate resin pellets |
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JP2005098245 | 2005-03-30 | ||
JP2005-098245 | 2005-03-30 |
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WO2006112196A1 true WO2006112196A1 (ja) | 2006-10-26 |
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Country Status (5)
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US (1) | US20090023866A1 (ja) |
EP (1) | EP1865018A1 (ja) |
KR (1) | KR20070122449A (ja) |
CN (1) | CN101151301A (ja) |
WO (1) | WO2006112196A1 (ja) |
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TW200630415A (en) * | 2004-12-21 | 2006-09-01 | Clariant Int Ltd | Process for the preparation of cross-linked PBT particles |
US20100327728A1 (en) * | 2009-06-30 | 2010-12-30 | Sumitomo Chemical Company, Limited | Method for producing resin composition, resin composition, reflection plate and light-emitting device |
DE102011054629A1 (de) * | 2011-10-20 | 2013-04-25 | Minervius Gmbh | Verfahren zur Herstellung von Gegenständen aus strahlenvernetztem Polyamid |
CN104140524B (zh) * | 2013-05-08 | 2016-06-29 | 中国科学院理化技术研究所 | 一种共聚酯及其制备方法和应用 |
CN110041674B (zh) * | 2019-05-14 | 2021-07-20 | 河南省科学院同位素研究所有限责任公司 | 一种无卤阻燃pbt/hdpe复合材料 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH06275129A (ja) * | 1993-03-24 | 1994-09-30 | Hitachi Cable Ltd | 電気絶縁組成物および電線・ケーブル |
JPH10147720A (ja) * | 1996-09-20 | 1998-06-02 | Daicel Chem Ind Ltd | 架橋性樹脂組成物、それから得られる架橋成形体およびその用途 |
JP2004203948A (ja) * | 2002-12-24 | 2004-07-22 | Shikoku Chem Corp | ポリブチレンテレフタレート樹脂組成物 |
-
2006
- 2006-03-09 WO PCT/JP2006/304565 patent/WO2006112196A1/ja active Application Filing
- 2006-03-09 US US11/883,325 patent/US20090023866A1/en not_active Abandoned
- 2006-03-09 KR KR1020077018536A patent/KR20070122449A/ko not_active Application Discontinuation
- 2006-03-09 EP EP06715436A patent/EP1865018A1/en not_active Withdrawn
- 2006-03-09 CN CNA2006800100484A patent/CN101151301A/zh active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06275129A (ja) * | 1993-03-24 | 1994-09-30 | Hitachi Cable Ltd | 電気絶縁組成物および電線・ケーブル |
JPH10147720A (ja) * | 1996-09-20 | 1998-06-02 | Daicel Chem Ind Ltd | 架橋性樹脂組成物、それから得られる架橋成形体およびその用途 |
JP2004203948A (ja) * | 2002-12-24 | 2004-07-22 | Shikoku Chem Corp | ポリブチレンテレフタレート樹脂組成物 |
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US20090023866A1 (en) | 2009-01-22 |
KR20070122449A (ko) | 2007-12-31 |
EP1865018A1 (en) | 2007-12-12 |
CN101151301A (zh) | 2008-03-26 |
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